Extended view on the dust shells around two carbon stars M. Mečina, B. Aringer, W. Nowotny, M. A. T. Groenewegen, F. Kerschbaum, M. Brunner and H.-P. Gail A&A, 644 (2020) A66 Published online: 01 December 2020 DOI: 10.1051/0004-6361/202039178